x402-402-compat-report

Know whether a 402 will work with your client before you pay it: pass the URL and one GET returns whether the payment challenge is readable by x402 v2 clients (the PAYMENT-REQUIRED header), readable by v1 clients (the JSON body), or neither — and exactly which required fields are missing from the accepts[] it serves. curl: GET /compat-check?url=https://api.example.com/paid. Response: {verdict:{buy

Open endpoint ↗

Price per call: $0.02
Chain: Base
Method: GET
Paid calls · 30 days: 0

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://x402-catalog-history.ai-business-surface.workers.dev/compat-check", { method: "GET" });
console.log(await res.json());

https://x402-catalog-history.ai-business-surface.workers.dev/compat-check